// pages/recommendSong/recommendSong.js
import request from "../../utils/request"
import regeneratorRuntime  from '../../utils/runtime'
import PubSub from 'pubsub-js'
Page({

  /**
   * 页面的初始数据
   */
  data: {
    day:'', //天
    month:'' ,// 月
    recommendList:'',
    index: 0,

  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    // 判断用户是否登录
    let userInfo  = wx.getStorageSync('userInfo')
    if(!userInfo){
      wx.showToast({
        title: '请先登录',
        icon:'none',
        success:()=>{
          wx.reLaunch({
            url: '/pages/login/login',
          })
        }
      })
    }
    this.setData({
      day: new Date().getDate(),
      month:new Date().getMonth() + 1,
    })

    // 获取每日需求数据
    
    this.getRecommendList();

    // 订阅来自songDetail页面发布消息
    PubSub.subscribe('switchType' ,(msg ,type)=>{
      let{recommendList,index} = this.data;
      if (type === 'pre') { //上一首
        (index === 0) && (index = recommendList.length);
        index -= 1;
      }else{ //下一首
        (index === recommendList.length -1 ) && (index = -1);
        index += 1;
      }
      // 更新下标
      this.setData({
        index
      })
      let musicId = recommendList[index].id

      PubSub.publish('musicId',musicId);
    })

  },
  async getRecommendList(){
    let recommendListData = await request('/recommend/songs')
    this.setData({
      recommendList:recommendListData.recommend
    })
  },
  // 跳转到songDetail页面
  toSongDetail(even){
    let {song,index} = even.currentTarget.dataset;
    this.setData({
      index
    })
    wx.navigateTo({
      url: '/pages/songDetail/songDetail?musicId='+JSON.stringify(song.id),
    })
  },

  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {
   
  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {

  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {

  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {

  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {

  }
})